One thousand and twenty nine bp sequence of partial mitochondrial cytochrome b gene of 21 individuals representing 2 populations in the Pearl River(PR) system and 1 population in Han River(HR) in South China was sequenced,and 11 haplotypes and 14 variable sites were detected.Haplotype diversity(h) and nucleotide diversity(π) were much lower in population from HR (h=0.464 and π=0.000 97) than those in populations from Zuojiang and Yujiang in the PR system(h=0.929-1,π=0.023 6-0.036 9).Individuals from different locations in neighbor-joining tree were intertwined showing neither genealogical nor geographic clusters.Pairwise comparison of Fst and AMOVA analysis indicated that there was no significant genetic divergence among 3 populations.As expected from star-like networks,FS tests and Tajima's D tests of whole population were significantly negative,and mismatch distributions were unimodal,indicating a Pleistocene population expansion at about 164 000-66 000Ka BP.
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